mayer



' Septy; 1-927.

W. MAYER` TRAILER c'ourLsn Yoriginal Filed'Jan. so, 1924 5 shee's-sheet? WITNESSES ATTORNEY Sept. 6 1927. l Re. 165731.

- w. MAYER 'rn-Amm COUPLER original' Filed han; so. 1924 s sheets-sheet a 3740,'A I J2 INVENTOR y MMA/AM MAYER Y ATTORNEY I and classes ofthose vehicles in use at theiik-castiga seat. e', lez?. UNITED 'TRAILER original No, 1,550,555, dated Angustia, 1,925, scrinium. 63u54, mea Januari ao, 192i. summon- ,ur i Y Y y reissue led December 4, A f., 1.

This invention .relates to' tractorsl and trailers `and particularly tojan` improved coupling mechanism thereforincluding power mechanism for causing anactuation of certain of the connecting parts.

Heretofore in the prior practiceof elect.`

ing the-coupling of tractors andthe like to trailers, various devices and vmechanisms have been designedv fortlie purpose, and have to a greater or lesser extent been successful to meet the .requirements of the types 'timefof their development. However, in the elapsed time since the prior types of suc-h devices andmechanisms were. brought into ,.existence, the types and classes of tractors and `trailers have changed, so as to render .the successful use of.the`deviees or mecha.-

' n'isms aforesaidpractically obsolete and of little value to meet the heavy duty require- 'ments' called forin the handlingfoiloads-`Y -ranging up Ato forty tonsor more asV is now of 'common occurrence, or, at least,

not Without seriousmodification and refine mentpin arrangement and constructlon. The

y present invention is designed t meet these lmodern demands and requirements, and pro- -vides for theraising and le' Y Y 'of the trailer'l to be coupled'both `efore1`and\ l l`1gur 1 11's a sldevieWlD Part 0fbythe trailer. `Notvonly'v does ythe Vpresent l 'showing thetrailer elevated-With the elestructure provide for theraisng and loweringof these Yheavy loads,but it 'also lprofiorA vehicle fsupporting Ispring' compression and easily accomplishedwithout in'. any way disturbing lor otherwise necessitating4 a .dis-

' placement or shiftingof a load that elevsred end.

The prmcipal .object-ouf the present inven .tion is, therefore, to-.provide -or a device 45,1 or mechanismoffthe charactermentioned,"

1' and l.one embodying certain vmechanical rei ,"nements'in fcolrstruation and arrangement and to overcome certain serious disadvany. tages.- difiiculties and mechanical defects resof parts and cooperative devices or mechanis'ms, which will be capable of electively. and' efficiently meeting any andall` lcondition'sinvolye'd'in'thekcoupling together of the 'heavy-duty types of tractors ,and trailers,

STATES rAT'E WILLIAMMAYEB, or NEWfYoBx, N. Y.-`

vides forI ara-nge of liftto amply compensate line y5---5 Vof Figure 4.

A Re. l,16,731

ocurran.

192s, serial. No. 152,706.

.-idzent in the known Atypes such,devi'ces,or

mechanisms.' I

A nobject o'f the invention is to p rovide an improved construction wherein 'means are yprovided forl connecting th'e engineof 'fthe tractor-to certain parts of the coupling q An additional object is to provide a cou-V pling structure for trailers fin which the trailer is .raised fromfpower derived from thetractor'engine, the same being associated .with an adjustable support for the trailer. capable of supporting-the rsame-*after itfhas been arranged andthe tractorremved. J

A further object is to provide anim? proved struc'ture- 'which will effect acoupling ""between'power, tractors ontrueksdvith trail-g ers v`designed forgexceedingly heary loads,

the structure being such also as to permit the raising andlowering of one end 'of the trailer and'its loadduring thecoupling and -uncoiipling action.

J atractor 4and trailer, with couplings embodying the invention shown applied thereto."

. Figure is a View similar to Figure 1 but vating-means moved back to their-l former position.

Figure. 3 is an enlarged fragmentary view vof the--lower'part of the support shown in ,Figures 1 and 2, illustrating how the pawls thereof -may be `thrown, out of engagement.

VFigurel is 'a top plan view ofthe rear part of` the tractor showing ,parti of the coupling mechanism and the king pin of the rtrailer in section. l

^ Figure 5 1s a. transverse vertical sectional view through Figure 4,

AFigure 6 .is a longitudinal vertical sectional vie'w through Figure 4, approximately on line (5f-6 lin Figure 4.

'Figuref is a fragmentary sectional view through Figure 4, approximately on line 7 7 in-Figure 4.

by numerals, 1 indicates a. tractor ot any approximately on longitudinal.

NT' OFFCB. y

Referring to the accompanying' drawings 4connected to .the tractor land disconnected therefrom whenever desired. The particular construction of the tractor l and the trailer- 2 forms no part of the' present invention but only thecouplingA and associated structures.

lio

pled together.

The invention also includes a-coupling structure which functions to takecare of exceedingly heavy loads. During the coupling and uncoupling, the structure acts to raise and lower eectively, not only -the coupling mechanism, but one end of the trailer with As indicated in Figure 1a standard 3fis provided pivotally`inounted at 4 to the trailer 2 and acting to support the trailer as indicated in Figure 2 when the tractor 1l is moved away. The standard 3 is provided with a bar 5 swingingly supported at 4 and provided with oppositely extending ratchet teeth 6 for receiving the respective pawls 7 and 8. These pawls are carried by ibase '9 into which the lower end of the rod 5 extends. The pawls 7 and 8 have suitable pivotal supports which extend to the exterior rof the base 9 and connected to these .the description of one will apply to bot-li.

pivotal supports are arms 10 and 11 connected by a link 12 (Figure 3,) whereby upon the actuation of the crank member 13 se-v cured to arm 10, Aboth pawls may be throwny into and out ofoperation at any time.

When the trailer is being pulled by the tractor 1, the standard 3 is arranged as shown in dotted lines in Figure 1 and. supported by a suitable hook 14 or other suit.

able supporting members. Vhen it is de- `sired to lift the trailer at a given point and move the tractor away, the standard 3 is swung down-to the ullline position shown in-Figure l and then the parts actuated as hereinafter fully described for elevatingV the trailer 2 as shown in Figure 2 whereupon the tractor 1 may be readily moved away.-

In order to raise the front of the trailer 2 as shown in Figure 2 and to lower the same, special mechanism is provided on the tractor .1 which is adapted to be actua-ted in both directions by the engine of the tractor. In Figure 4, will be'seen a top plan view of the rear part of the tractor from which it will be seen that a bolster 15 is provided which extends from near one side to near the opposite side of the tractor and which is flat but rounded at each end and enlarged or swelled outwardly horizontally in the center. A suitable aperture 16 is provided in the center of the bolster 15 as shown in Figure 5, said aperture being adapted to receive the coupling pin or king pin 17, preferably formed integral with the plate 18, which plate is bolted or otherwise rigidly secured to the bottom oi the trailer V2. When the pin 17 is in the position shown in Figure 5, the trailer and tractor are cou- Froin Figure 7, it will be noted that the pin 17 Ais] provided with a groove 19 o'r receiving a lock-ing yoke 20, Awhich yoke may be formed integral with the arm 2l or may be'mounted in some other manner whereby Vitcan be moved into and lever 22 is vrigidly secured to or formed integral with the arm 21 and a suitable pivotal pin 23 extends through thejuncture of the arm 21 and lever 22, said pin extending intothe bolster 15. A'plate 24.is bolted or otherwise rigidly secured to the bolster 15 and extends at right angles thereto for a short distance as shown in Figure 4, in order to receive the removable pin 25.

When the parts are 1n the position shown in Figure 4, the yoke `is positioned in thev groove 19 and, consequently, the coupling pin 17 is `locked against disengagement. When it is desired to disengage the coupling pin, the pin 25 is removed and the lever22 may be moved over to the dotted position shown in Figure 4 and pin 25 re-inserted whereupon yoke 20 will be locked in an outer` position.

`As both sides of the device are identical,

As indicated particularlyl in Figures-5 and 6, the ends of the bolster 15 are provided with rounded sections 26 which rest in asuittical screw 28. A binding or retaining strap 29 of sheet metal. is mounted over the rounded portion 26 and is secured to the head 27 by a suitable pin 30.l The head 27 with its strap 29, is mounted to reciprocate in a vertical guide 31 which is U-shaped in cross section, with the open part of the structure facing inwardly. In other words, a deep channel iron is used for forming `the guide 31, said channel iron being secured by welding or otherwise to the socket member 32 which turn is mounted on the transversel U-shaped channel. 33forming part of the tractor frame. The socket member 32 may be secured in place in any desired mannerbut ordinarily it may be retained in place by friction and said socket member having outwardly turned flanges 34 and 35 at the top so as to distributethe strain over all parts of the channel iron 33 atl the end there'- of. The screw 28 extends through the socket member 32 and also'the channel iron- Vout of engagement with the pin 17. A hand vable head 27 merging 'into a threaded verllO tiiiually meshes with the worm 40 secured to the shaft 41 whereby whenever the shaft 41 is rotated, the worm gear will be-rotated legal "i and, consequently the' screw lwill be raised ori-'lowered accordingto the direction `of rov' tation ofthe various parts. As the dupli- 'shaft 41 andassociated arts, the said shaft. is provided with a sproc et wheel 42 for acimv commodating the chain 43, which chain 41, vthe .bolster 15 will as the c'ase may be.

"cate of this same structure vis'on the o 'positef-sidei-andoperated by' the same s aft LIn order to secure aproper drive lforl'the passes 'over a sprocket Wheel 44 rigidly secured to the shaft .45. The vshaft 45 1s mounted in suitable bearings connected with thevarious parts of the tractor and hasa bevel gear 46 `rigidl secured thereto near one end. This beve gear co-acts with the bevel pinions`47 and 48, vWhichpinions are moved into mesh with the bevel gear Whenever it is desired to raise or lowerl the bolster 15. T he pinions, 47 and 48 are rigidlysecured to'a shaft 49 supported by 'suitable bearings-.which Will'permitthe Vsha'ftto freely rotate and also freely reciprocate. rThis i capa le at different timesof meshing withL shaft near the front is provided v vith'a pair 'of gear wheels 50 and 51, said gear wheels bein fspace'd a short ldistance apart and thefdriving pinion 52 secured to the shaft 53 extending from the transmission 54 or connected to the propeller shaft of the engine `.where there 1s no power take-ofi' shaft in the transmission. The transmission 54 is of any usual `or preferred type used on tractors and, therefore, will not need a detail description.

The shaft 49 is reciprocated by any suitable means, as for instance, a hand lever 55, said lever extending either. to the drivers seat or` to some other convenienti point.v When the tractor is operating to pull thetrailer, the gear Wheels 50 and 51 are in the position shown in Figure 6. If it shouldbe ldesired to remove the trailer fromthe tractor, the shaft 49 is shifted` until the gear wheel 51 fully meshes with the pinion 52. Vhen this occurs, .the bevel pinion 47 will be in mesh .with the bevel gear 46. 'The tractor engine is preferably operating before or at the time this takes placebut the clutch is released ,which naturally stops the gear- 52 to permit the ready engagement of the gear Wheel 51. After the gear wheel 51 has been properly brought into mesh, the clutch is `again thrown in so that the shaft will immediately begin to rotate which will transmit Apower to the shaft 41 and from thence to the Worm 40 and worm gear 36 co-ac'ting With the respective Screws 28 for raising.

the bolster 15 and associated parts.

Before this raising action has taken place',

it will be necessary to shift the lever 22 to`V the dotted position shown in Figure 4 in order to release the pin 17. When this has been done and the bolster 15 has been raised be. raisedand lowered gear 51 to mesh with the. pinion'52.

toI substantiall the 'position l'shoiwn yin Fig. ure 2,A thesha t 449 and associated parts are moved back to the position sh'oW-n Vin Figure 6 but the engine of the tractor is notlstopped.`

A W'hen thisV has been done, 'the operator assures himself that the standard 31' has properly functioned and drives the 'tractor away -to the desired .p ointl Preferably, before .the

tractor is' driven avvay, .the bolster 15 and associated parts are-lowered to their former position. a To dothis, the -clutc'h is again releasedand the .shaft 49 moved'in'a reverse 4direction a sufficient distance to 'cause the gear Wheel (Figure ,6) tomcsh .with piny.ion 52 and the bevel pinion 48 'to mesh .with

the bevel gear 46. After this slrifting of gears has taken place, the clutch isagain operated and the parts `will be actuated 'whereupon the Worm Wheel 36. and associated parts 'Will be actuatedl for movlin gthe bolster'15 downwardly/to its for- `nier position, namely, -theposition `shown 111-F1gure 5. The clutch is again :released and shaft 26 moved until-ther parts are movedfto a neutral position as shown Jin Figure 6. The lclutch may be again .let in and the tractor Started inthe usual Way.v

When 1t 1s again desiredto'connect the tractor tothe trailer, the tractor is backed into position, as. for instance, into the posi-v tlon shown in Figure 2. and lever 55. is again shifted for causing the gear 51 to mesh with the'pinion 52. .When backing the tractor in position, it may be .backed directly4 in line as shown in Figure 1, orv backed into position from different angles, as for instance, a ninety degree angle. This is very desirable, as quite often the -width of the street or other ob]ections, prevents the tractor ,from backing in from a front position.v After the tractor has been backedA into osition, lever 55 is shifted as above set fortli for causing the This will cause the bolster l5'to become elevated .and the elevation is continued until the piu .17 1s 1n the position shown in Figure 5'and in fact, until the forward end of the' trailer 2 has been lifted slightly. `When this has occurred, the parts are-moved tothe neutral position shown in Figure 6 and the standard .f3 is manually shifted to the position shown 1n dotted lines in Figure'l. l,The shaft 49 is Vagain operated'to' move the gear wheel 50 into mesh with the vpinion 52- in Lorder to cause the arts to' be actuated. for again lowering the olster 15 to substantially the osition .shovvn inv Figure 5.. reached this position, the parts are again moved to the neutral position shown in Figure 6 and-the trailer and tractor are coupled, ready for use together.

will functionfor accomplishing this result without the use of-the locking lever, though ordinarily, some form of lock is desirable.

When it as min-coupling and uncoupling, thenp'arts Whreithe trailer is carrying aheavy load, Lthe lock might be dispensed with but where it is` carrying'a light load the lock is' prefi erable'. Also, it will be evident that the rais- 'ing and lowering means of the bolster may l. A coupling for heavy dutyitrailer's an'dtractors, comprising a coupling member 7 adaptedto berv connected with the trailer, a bolster adapted to be mounted 'on the tracl5 tor, said bolster having means forinterlocking withsaind coupling member, a` pair 'of ers for raising 'and lowering said bolster and theend of said trailer withl 'or Without` load, said* reciprocating y members being theaded at their lower ends,

meansfor guiding. said reciprocating members'and said bolster'in their-movement,` a worml gear.. provided with a threaded bore -for receiving each of said threaded members,

. a worm meshingwith' each of said worm gears, va shaft connecting said worms 'whereby they will be operated simultaneously,

and means connecting said shaft with the engine `of the ltractor for actuating said shaft and gear wheels to. actuate said reciprocatmg membersfsaid means lncludmg a reversing mechanism lwhereby said shaft ma rotated in either direction by power rom the engine.

and trailers, a coupling member connected with the trailer, a bolster formed with means for interlocking with said coupling member', .said bolster being mounted on said. tractor,

4o lmeans for moving said bolster into and out of enwagement with said coupling member and ailso raising and lowering o ne end of the trailer with or withoutload, said means including a plurality of threaded rods arranged vertically, a gear wheel threaded onto each ofthe threaded rods, a co-,acting gear for each of the gearvwheels'for actuating ,the Same, said first mentioned gear wheels being fixed whereby as they are rotated the threaded members and bolster willI @be raised and lowered according to the direction of rotation, a shaft for rotating said co-acting gears, and a plurality of means for connect-ing said shaftwit-h the engine of the tractor, said plurality of means including a power gear connected with the engine and rotated thereby, a forwardly driving gear, a train of reversing gears, a hand operated member for shifting said forwardly driving G0 gear and said train of reversing gears respectively into andout of mesh with said power gear for causing a connection and disconnection with said engine anda reversal of' said gearsiaccording to thevd'irection of 35 movement of said 'hand operated member.

2. In a coupling for heavy duty tractors said bolster `being mounted on a tractor,

means for connecting the engine of the tractor with `the bolster for causing the bolster to be moved upwardly and downwardly, said means including l a reciprocating shaft, manually actuated means for reciprocating said shaft, a pinion connected with said en gine, a. pair of gear wheels mounted rigidly on said shaft and spacedapart a proper distance so that when said shaft is movedinv `one direction to its extreme position, one of the gear wheelsv will mesh with said pinion l and when moved tof its opposite extreme position, "the other of the gear wheels will be in mesh with said pinion, a pair of bevel pinions mounted on said shaft and spaced apart, a' bevel gear adaptedto mesh at different times witlrsaid pinions, said bevel pinions being spaced apart a. proper distance tobe moved into engagement with said -bevel gear when said shaft is moved to its respective` extreme positions, a pair ofA threaded members connected with said bolster, a fixed worm gear lthreaded onto said threaded members and means for driving said worm gears from said bevel gear.

4. A heavy duty trailer hoist and coupler be comprising a coupling member connected with `the trailer, a bolster `adapted to be mounted on a tractor and formed with means for interlocking with said coupling member, means on the tractor forraising and loweringsaid bolster into and out of.

engagement with said coupling member, said means including a forward and 'a reversing drive mechanism operatively connected with the engine of the tractor whereby the engine .of the .tractor will raise and lower the bolster, and the end of the trailer with or without load, manually shiftable means for shifting said drive mechanism for connecting the engine with the raising and lowering mea-ns, and means associated with the bolster forflocking said couplingjmember in engagement with the bolster when the parts arc in coupling position.

5. In a coupling for trailers and tractors, a coupling member carried by the trailer, a vertically movable bolster for receiving said coupling member, said bolster being mounted on a tractor, means for connecting the engine of the tractor with the bolster for causingy the bolsterto be moved upwardly and downwardly,'said means including a reciprocating shaft, manually actuated meansfor reciprocating said shaft, a pinion connected with said engine, a pair of gear wheels mounted rigidly on said shaft and spaced apart a proper distance so that `when said shaft is moved in oneA direction to its extreme position, one of the gear loo ilu

.wheels will mesh with-saidpinion and when' I move/dto its opposite" extreme'vposition, the

other-'of the with p mounted on,` slaidf'shaiftl, andgspaced a bevel Igear.I adaptedfto"mesht y,diiierent gea-r wheels willv bein mesh times .with said pignons, `saidfbevel pinior c, being spaced 'apart'..4 proper'distanceA to be moved into engagement with said'bevel gear' .whensaid sh'a'ft'is' moved' to' itsres ectiv'e extreme positions, andjmeans"forl riving -said worm lgears from saidbevel gear. L

6. 'couplinga'nd-hoist for aftrac'tor and i heavy duty trailerv comprising interlocking Leou'plingmembe'rs, one of said members; acting as'a'hoistin 'Lmemberfa plurality of ver` 'any the engine of .the tractor or causing an r,ac- 1 Y tieally,'movablieciproeating members for raisin u and. simultaneously V.raising and `lowering and, lowering v said Ihoisting .member 'one end of'theitrailer with-or witlig'ut load, meansor guidingsaid reciprocating meinbers. and saidfhoisting memberin' their moyement, a1 gear-l foi. eachf of the`recip1'o- -cating' members' for., raising and lowering the same,rmeans 'cbnnect1n` r said gears with tuation thereof, vSaid lastnientioned means4 including a. `forward driving gear, .a train of reversinggears, a power gear connected with the -engine 4and adapted to `berotated v flin one direction, and'.A shi'ftable meansffor causing said forward driving gear and 'said f train ofp'i'eversing gears rto beconnecte'd and `disconnected jwith said power gear.,

'LAv heavy. duty` trailer coupling, coI'n-' prising' a coupling ymember -adapted to be connected with a trailer, a bolster adapted to be mounted .on' af tractor and formed with" means for'i'eceiving said couplingI member, vn ie'ansonthe tract-or forraising and lower-I ing one endof 'said trailer', with or without.

loam-whileraising,andflowering said bolster into and outfofengagement' with said couplingmember, said'means being operatively i `'gin'neted with the en ine of the tractor whereby the engine ',of t e -tractor 'will raise l fand; lower,the" bolster, manually shiftable' -meansffor connect-ing and disconnecting the '-engine. from the #raising andy vlowering "i'lneans,- saidmanuall-y shiftable means in,-v

vcluding a reversing mechanism,'.and manually 'Shiftable means carried by the bolster Vforlocking said coupling member in enpartsv gagement with the` bolster when the are in coupling position; l

8. A,` coupling and hoist for a heavy duty vtractor and trailer comprising interlocking coupling members, A'one of said members acting as Aa hoisting member, 'means on the tractor for' raising and lowering ,said hoistingl member intoand out lofen'gagement with the other coupling member, said means being operatively connectedL with said raising and lowering means Iand'. with the engine` of the tractor whereby theengine of the said pin1on, ll-a`pair of jbevel pinions. apart,"

tractoi-will raise and lowercthe hoisting member, and shiftable 'means including a reversing mechanism for connecting and disconnecting the engine with the raising and lowering. means, said shiftable means including a manually actuated member.

9. A coupling and ,hoist for a heavy duty tractor` and trailer comprising interlocking coupling members, one of which acts as af hoisting member, a plurality of vertically movable -membersfmo'urited on the .tractor- 'for raising the'hoisting member and one end-"of the trailer,`with or without load,

while causing said 4'coupling members to in-A terlock, means including toothed members for `raising and lowering said vertically movable members, connecting means for operatively connecting 'the last' 'mentioned ,meansfwith theengine of thetractor whered by the engine-,orn the tractor will furnish power forcraisingand lowering the hoistnecting the'vengine with saiduconnecting means:

duty-tractor and ltrailercomprising a c oupling member, a bolster having means for 10. 'Ay coupling andidhoistlfor a heavy ing membeig'land meansincluding areversl ing mechanism ,for connecting and disconreceiving said coupling member, a vertically movable structure-on the tractor forcausing the^c0upling member and bolster to be engaged and disengaged, said vertically movable structureacting t6 raise the end of said trailer, with Yo'riwithout load, -when m'oved to a coupling" position, means operatively connected with said vertically movable structure and with the 'fen ine of the tractor whereby'the engine of`t e tractor will cause '.sa'id .vertically movable structure to function, and `shiftable means'including a reversing mechanisinvfor connectingand disconnecting the enginewith said raising and flowering means, said shiftable .means including'a manually actuated member for moving the shiftable means'in one direction.y

11,;A hoist and coupler fora heavy duty tractor and 'trailer/comprisingfa cou ling member adapted to be connected wit] t-lie trailer, a bolster adapted to be mounted on a tractor and formedfwith an opening for receiving said coupling member,'ieans on fthe tractor forfaising land lowering said bolster into and out of engagement with said coiipling member, said means acting to lift one endof the trailer, with 4or without load, when the bolster is raised, said means being;r operatively connected with thev engine of the" tractor whereby the engine of the.

tractor will raise and lower the bolster, manually shiftable means including a .reversing mechanism for connecting the engine ywith the raising and lowering means, and means associated with the bolster for locking said coupling member in engagement 12. A'hoist and coupler for a heavy duty tractor and trailer comprising a coupling member adapted to be connected with a Llt) trailer, a bolster adapted to be mounted on a tractor and formed with means for receiving said coupling member, means onthe tractor for raising and lowering said bolster into and out of engagement with said coupling member, said means being operatively connected with the engine-of the tractor whereby the engine of the Vtractor will raise and lower the bolst-er, and also the end of the trailer with or Without load, shiftable means for connecting and disconnecting the engine with the raising and lowering means. said shiftable means including a rever/sing mechanism" and manually actuated member for causing the engine'to be connected with said raising and lowering means, and shiftable means for locking said coupling member in engagement with the bolster when the parts are in coupling position.

13. A coupling and hoist for a heavy duty tractor and trailer comprising interlocking coupling and hoisting members, vertically -movable members on the tractor for raising and lowering said hoisting member, and the end of said trailer Withor without load, means including a reversing mechanism for operatively connecting said ,raising and lowering means with the engine of the tractor whereby the engine'of the tractor will raise and lower tliehoisting member, and shiftable means for connecting and disconnecting thecngine with the' raising and lowering means, said" shiftable means, including a manually actuated member.l Y.

14. A heavyduty tractor and trailer hoist and coupler` comprising interlocking coupling members, one lof said members also actingas a hoisting member flor raising the end of thetrailer Withor without load and the coupling membersiinto coupling position, a vertically movable structure on the tractor for causing the coupling member to engage and disengage, means including'a reversing able structure to function, and shiftable means for connecting and disconnecting the engine With the raising and lowering means` said shiftable means including a manually .actuated member for moving the shiftable means in one direction.. a A

15. A trailer lioistand coupler comprising a coupling member' and av hoisting'member,

said members being adapted to interlock, a

movable structure on the tractor for rais# ing and lovvering said hoisting member and the end of the trailer, means for operatively connecting said movable structure with. the engine of the tractor whereby the engine `of the tractor will raise and lower s aid hoisting member, and means for locking said hoisting member .and said coupling member together. v

16.' A heavy duty trailer hoist and coupler comprisingiinterlocking coupling and hoisting members, "movable means on the tractor for raisingan-d-lowering said hoisting meinber, said movable means also functioning to raise lower one end of the trailer with or without load, means for operatively connecting: said movable means with tlie engine of the tractor whereby the engine of thel tractor will raise and lower said hoisting member, means for locking together said intei-locking coupling and hoisting members, and shiftable means for connecting and disconnecting the engine with the raising and lovgering means, said shiftable' means including a manually actuated member.

WILLIAM MAYER y 

